Special Gates

Introduction to Digital Logic - CPE2210 - 12 February 2018

  • NAND
    • Outputs 0 when both inputs are 1 (opposite of AND)
  • NOR
    • Outputs 1 if both inputs are 0 (opposite of OR)
  • XOR ⊕
    • Outputs 1 when there are only odd numbered 1s inputted
  • XNOR
    • Outputs 1 when there are only even numbered 1s inputted

Expressing the gates as other gates

  • NOT = same input NAND, same input NOR
  • AND = double NAND, double NOT NOR
  • OR = double NOT NAND, double NOR